Most Linux systems expose the CID via sysfs. Run:
| Field | Bytes | Description | | :--- | :--- | :--- | | | 0 | Manufacturer ID. I mapped the most common IDs (Samsung, SanDisk, Toshiba, Micron) in the script. | | OID | 1-2 | OEM/Application ID. Usually 2 characters hex identifying the card customer or specific application. | | PNM | 3-8 | Product Name. ASCII string (up to 6 characters). Often model numbers like "BJTD4R" or "8GTF4". | | PRV | 9 | Product Revision. Binary Coded Decimal (BCD). 0x18 = Rev 1.8. | | PSN | 10-13 | Product Serial Number. A 32-bit unique integer. | | MDT | 14 | Manufacturing Date. 4 bits for Month (1-12), 4 bits for Year (Offset from 1997). | | CRC | 15 | Cyclic Redundancy Check. The script verifies this to ensure the CID is valid and not corrupted. | emmc cid decoder
Indicates the hardware and firmware revision of the controller. Most Linux systems expose the CID via sysfs
You can run this script in any standard Python environment. It uses the built-in sys module, so no external installations are required. | | OID | 1-2 | OEM/Application ID